Abstract: A throttling device for restricting the flow of flushing fluid from a source of supply through a mechanical seal in which the throttle includes two members which are rotatably connected in fluid-tight relationship with respect to one another and which have a plurality of fluid flow openings there through which are symmetrically located about a common axis and which are selectively aligned to create varying fluid flow paths of varying diameters so that the flushing fluid is selectively channeled therethrough to an eddy current chamber within one of the members which serves to further restrict the flow of fluid with respect to the seal.